Pneumatic tire

Abstract

Provided is a pneumatic tire. A belt cover layer made of an organic fiber cord spirally wound along the tire circumferential direction is provided on the outer circumferential side of a belt layer in a tread portion, and a polyethylene terephthalate fiber cord of which the elastic modulus under a load of 2.0 cN / dtex at 100° C. is in the range of 3.5 cN / (tex·%) to 5.5 cN / (tex·%) is used as the organic fiber cord. The coating rubber covering the organic fiber cord contains one or more of natural rubber, styrene-butadiene rubber, or butadiene rubber as a rubber component. The coating rubber is formed of a rubber composition in which the content of natural rubber in the rubber component is 50 mass % or more, and 5.0 parts by mass to 9.0 parts by mass of zinc oxide is blended per 100 parts by mass of the rubber component.

Description

TECHNICAL FIELD

[0001] The present technology relates to a pneumatic tire using polyethylene terephthalate (PET) fiber cords in a belt cover layer.BACKGROUND ART

[0002] Pneumatic tires for a passenger vehicle or a light truck typically include a structure in which a carcass layer is mounted between a pair of bead portions, a plurality of belt layers are disposed on an outer circumferential side of the carcass layer in a tread portion, and a belt cover layer is disposed on an outer circumferential side of the belt layer, the belt cover layer including a plurality of organic fiber cords spirally wound along a tire circumferential direction. In this structure, the belt cover layer contributes to the improvement of high-speed durability and also contributes to the reduction of mid-range frequency road noise.

[0003] In the related art, nylon fiber cords are mainly applied to the organic fiber cords used in the belt cover layer; however, it has been proposed to use polyethylene terephthalate fi...

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